Acoustic vibrator



Sept. 24, 1929.l R. T. WATTS ET AL 1,729,233

ACOUSTIC VIBRATOR r'iled July 24, 1926 W Wmvsmg am www ATTORNEY Patented sept. 24, 1929 UNITED vsri-russ PA'rEN'r OFFICE,

ROY r. WATTS; onBAL'rmonE, MARYLAND, AND JOHN J.' CARR, oF smcusn, NEW

'v YORK, ASSIGNORS, B MESNE ASSIGNIENTS, T0 WILLIAM W. VARNEY, 0F BALTI- moan, MARYLAND ApplicationV led July 24,

The object of our invention is the providing of an improved acoustic vibrator. v A further obj ect of our invention is the providing Vof an improved acoustic vibrator of the portable type provided with means of folding so that the same may be carried dat and formed into a curved position when in use.

A further object of our invention is providing an im roved means of folding a portable acoustic vibrator whereby the edge near the old may assume substantially'the same curvature as other parts of the vibrator when in use.

A further object of our invention is providing an improved collapsible cone vibrator having means of substantially forming the same into a cone and the securing thereof or use.

Acoustic vibrator, the subject of this speciiication, is especially adapted for phono graphic and loud speaker use, but is equally well adapted for reception aswell as production.n rlhe means provided for accomplishing the objects of this invention are equally applicable forifo'rming what is known as a megaphone where portability may be had in liat form.

With the foregoing and other objects in view, our invention consists of the novel construction, combination and arrangement oia parts as hereinatterspecifi'cally described and illustrated in the accompanying drawings, wherein is shown the preferred embodiment of our invention, but it is understood that changes, variations and modications may be resorted to which come-within the scope of the claims hereunto appended. ln the drawings of the herein described embodiment of our invention Figure l is a plan view of the vibrator unfolded or opened out ready to be curved and secured. in position tol form a cone; Figure 2 is a sectional view .taken through Q-. o Figure l, looking in the direction of the arrows and Figure 3 is a sectionalview taken through 3 3 oldig. l, looking in the direction of the arrows.

Similar numerals refer to similar parts throughout the several views.

is an element or the cone'provided with lll AcoUsrIc viBRAroR l 1928. Serial No. 121,622.

an extended orwlip portion'2. 3 is an element of the cone not provided with the lip portion 2. These elements l. and 3 may be formed of any suitable flexible material for curving into working shape. We have found paper very successfulas it is light and easily handled as well as being cheap of construction. The paper may be treated, sized or coated as desired for durability or otherwise. We have found plain uncoated paper verysuccessful but where waterproofne'ss is desired where the vibrator is to be used in the open Weather, we have found that a suitable coating of'a water'- prooing character is desirable, vor flexible varnish. n

On either element l or 3 may be secured, securing clips 4. ln the drawing they are shown attached to element 3, and are secured thereto by means of eyelets 5. In the drawing we have shown two sets of clips 4, between which the element L is forced and clamped thereby. One clip only may be` used with success. wWe have found two met all requirements in the practice -of a small phonograph. More clips may be used, if desired. 'hese clips are usually made oit Y metal, but may be made of any resilient substance Atending to maintain its shape or springlihe condition for clamping purposes. Elements l, l and 3 are hinged together as shown in Figure 2, preferably by a fabric hinge 6. lln this case a piece of cloth pastedv aoA over the edge offelement 3 and unto element l some distance haelt from extended or llip portion 2 oi element l and likewise the joining orelernents l and l. lln collapsing the elements :told on themselves at junction of the hinge @and when folded out and curved with lip portion 2 curves and forces the edge to curve also, thus producing substantial and symmetrical cone when secured by means or clips 4l unto edge oit element l.

The cones as assembled, formed as above suggested, are clamped or secured to the vibrating mechanisms, forming no part of this l invention, there being a slight opening 7 at the small end or apex through which the i securing means is inserted.l While, techni?y cally, the cone is not a perfect geometrical cone having a perfect apex, but a truncated cone, the apex being so small; however, that we call it and treat it as a cone.

Having thus described our invention, What we claim, and desire to secure by Letters Patent is l. A Collapsible sound reproducing diaphragrn comprising a plurality of flexible elements, hinged together so as to forni an extended unit when opened out and nicans of securing the adjacent free edges to forni a curved structure.

2. A collapsible sound reproducing diaphragin coinprisinga plurality of flexible elements, hinged together so as to forni an extended unit when opened out and means of securing' the adjacent free edges to foi-1n a curved structu f-e, said hinged portion consist-ing` of joining adjacent'members with a connnon fibrous eleinent.

8. A collapsible sound reproducing diaphragm con'iprising' a plurality of flexible elements, hinged Itogether so as to forni an extended unit when opened out and means of securing the adjacent free edges to forni a curved structure, said hinged portion consisting ot' lapping one adjacent element over the other so that its free edge inay rest Within said other element at all times when said elen'ients are inwardly Curved with reference to said overlapping elenient.

4. A collapsible sound reproducing diaphragm having` a plurality of flexible elements hinged together, a hinge comprising means of securing' the edge of one element to another elenient at a predetermined distance from its edge.

5. A collapsible sound reproducing diaphragm having a plurality oi' flexible elements hinged together, a hinge comprising means of securing the edge of one element to another element at. a predetermined distance from its edge, consisting of a cloth strip secured to said elements at said point.

ROY T. VATTS. JOHN J CARR. 

